Innovation starts with a problem whose solution sets in motion all kinds of unexpected discoveries. That's why you can draw a line from pendulums to punching the clock at a factory, from ice blocks to summer movie blockbusters, from clean water to computer chips. Steven Johnson looks at how accidental genius, brilliant mistakes, and unintended consequences shape the way we live in the modern world. Johnson's "long zoom" approach connects history, geography, politics, and scientific advances with the deep curiousity of inventors or quirky interests of tinkerers to show how innovation truly comes about.